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Freebase(0.00 / 0 votes)Rate this definition: Log flume. A log flume is a flume specifically constructed to transport lumber and logs down mountainous terrain to a sawmill by using flowing water. These watertight trough-like channels could be built to span a long distance across chasms and down steep mountain slopes.
Flumes are static in nature - having no moving parts - and develop a relationship between the water level in the flume and the flow rate by restricting the flow of water in a variety of ways. Flumes can accelerate slow, sub-critical (Fr<1) flow to a supercritical state (Fr>1) by: 1  A change in elevation. 2  A contraction of the sidewalls. 3  Or a combination of the two.